Hair drug testing: Many street drugs (or their breakdown products in the body) are absorbed into the hair. A sample of hair can be tested for recent drug use. Hair analysis: Testing of hair for toxic exposures, such as lead or mercury poisoning.
Gas Water Heater, water not hot enough-Thermostat or Sediment. The dip tube probably disintigrated. The dip tub sends cold water to the bottom of the tank for heating when its heated it rises to the top of the tank. Its possible that the dip tube broke of and now you have cold water mixing with the hot water on top.
Not Enough Hot Water or Water Too Hot. Two of the most common problems with hot water heaters are that they produce water that is either not hot enough or too hot. Before you do anything else, adjust the temperature dial on the front of the water heater. Wait a little while, then check the water temperature at a faucet.